Rotary engine.



R. C. FRASER.

ROTARY ENGINE.

APPLICATION FILED MAY 9. 191:,

1,258,552. Patented Mar. 6,1918.

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Rifunu'us uulnvmuuuuoun H. C. FRASER.

womv ENGINE.

APPLICATION FILED AVG-19H.

Patented Mar. 5,1918.

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ROTARY ENGINE.

AVPLICA-TION FILED MAY 9. \911.

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H. C. FRASER.

ROTARY ENGINE.

APPLICATION FILED MAY 9. 1911.

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R. C. FRASER.

ROTARY ENGINE.

APPLLEATION man MAY 9. an.

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RIGHAED'CLAYTON FRASER, 01'' CENTRAL CITY, COLORADO, ASSIGNOR OFONE-THIRD TO WILLIATM It. FRASER, F D'URANGO. COLORADO.

ROTARY ENGINE.

Application filed May 9, 1917.

To (6 eu/wm it may concern:

Be it known that I, Rrormnn CLAYTON FRASER, a citizen of the UnitedStates, residing at Central City, in the county of Gilpin and State ofColorado, have invented certain new and useful Improvements in lotaryEngines; and I do hereby declare the following to be a full, clear, andexact description oi the invention such as Will enable others skilled inthe art to which it a mertains to make and use the same.

'lhis invention relates to rotary steam engines, and more particularlyto a rotary steam engine havin compound steam chamhers.

It is one at the objects of the present invention to provide a compact,simple engine, and a further object of the invention is to provide arotor having a series olf pockets in 3|) which steam under full boilerpressure may be utilized initially in a series ot high pressure pockets,and then subsequently the strain transiierred from these pockets intoLMllilllSlUll chambers which may be suitably ,5 arranged upon the rotor,the several chamlurs or pockets in the rotor of the engine being(wopentively disposed with relation to complementary steam chambers orpockin the casing oi? the engine.

it is another object of the present invention to provide an engine ofsuch construction that .it may be arranged or installed directly uponthe machine or apparatus which is to be driven, as, for instance, ineombiration with a machine tool, or for driving pin-poses in "vehicles,or may be utilized as a stationary engine when arranged upon a suitablesupport.

lit is another object of the invention to provide a compound, rotary andreversible steam engine, and one in which friction is eliminated as muchas possible and in which means are provided to pack the running parts atthe joints ot the respective ele 5 meats oi the motor so as to conservethe pressure of the steam.

Another and important object oil the present invention is to provide arotary, compound and reversible steam engine in which to the parts maybe readily mounted and dismounted for the pn pose of rnroviding l'or'encwal or repairs, and to enable ready acto the various portions of themotor.

res"

"l l ith thesev and other objects in view as.

Specification of Letters Patent.

Patented itlar. 5, 1918.

Serial No. 167,532.

specification, one cmbodimentof my inven tion is illustrated in theaccompanying drawlogs, in which:

ligure l. is a. side elevation, partly in sectron, showing the end ofthe engine which is provided with a set of mechanically operated Dvalves. V

Fig. is a vertical, central section, longitudinally of the engine.

3 is a detail view of the end plate of the engine showing the steamchest of the D valves and the plate being partly broken away to indicatethe position of the steam pockets.

Fig. -l. is a view ot' the engine casing with the end plate removed, andshowing the relation of the steam pockets and the rotor within thecasing from the same side of the engine illustrated in Fig. 3, andomitting the end plate thereof.

Fig. 5 is a side elevation of the. organized engine.

Fig. (3 is a detail view of the end plate showing the series of ductsand steam ports coordinate with a set of steam actuated piston valves,the latter being omitted from this figure.

Fig. 7 is an end elevation of the end plate shown in Fig. 6 andillustrating in sectional detail the piston valves and their steamconnection.

Fig. 8 is a horizontal section on line S8 oi '7, showing the pistonvalve in one at its positions, and

Fig. 9 is an end elevation oi? the engine looking toward the right handside of the engine in Fig. showing the cap removed and illustrating therotor and the casing partly in section to show the relation of the steampockets thereto.

In the present embodiment ol. my invention it shown as designed as astationary engine provided with a suitable bearing or ilramoworl; 2which is adaptable to be up propriately secured to a foundation orsupportin the usual or ordinary manner, although it is to be understoodthat the cooperative driving mechanisms of this en, may be utilized indirect combination with apparatus to be driven, such, for instance, asany machine tool or line shaft or vehicle transmission. it so desired.Journaled upon the uprights of the frame there is shown a suitable shaft3 which is provided with a rotor or rotary piston member l preferablykeyed as at 5 upon the shaft 3. The periphery of the rotor is suitablyinc-ased 0r inclosed in a cylindrical casing 6, and the opposite ends ofthe casing 6 on each side of the rotor 5 are provided with suitable endplates 7 and 8, which may be bolted or otherwise appropriately connectedto the casing or cylinder ring 6.

It is one of the important featiu'es of my present invention to providea rotary steam engine in which motive fluid force may be utilized firstat initially high pressure directly from a source of supply, and thensubsequently exhausted from the high pressure pockets or chambers toother and compound chambers. To that end the rotor l 1S provided with aseries of pockets 10, 1llustrated in Fig. 14., these being; peripherallydisposed about the circumference of the rotor and preferably are oftriangular longitudinal cross sectional form and provided at one endwith an inclined wall 10 against which steam is adapted to impingeduring the operation of the engine. These pockets 10 form the compoundchambers of the engine and are adapted to move successively intoopposition to complementary compound steam pockets 1]. of which there isone each at the top and at the botton'i of the engine cylinder 6. Thehigh pressure pockets or chambers in the rotor t are shown as arrangedin the end face of the rotor in Fig. l at 12-, there being in thisinstance shown four of the peripheral compound pockets 10 and four ofthe high pressure pockets 12 arranged in the side of the engine. It isone of the features of the invention to provide a reversible compoundfluid pressure operated engine, and to obtain this system of operationthe rotor preferably is constructed with two series of the compoundpockets 10, as illustrated in Fig. 2, and also with two series of thepockets 12 in the opposite end walls of the rotor 4-, as illustrated indotted lines in Fig. 2. ihe reve driving operation of the rotor 45 issecured by reversing the direction of the pitch or inclination of theabutment walls 10' and 12 respectively of the pockets 10 and 12 so thatwhen steam is admitted, for instance to the pockets 10 and 12, Fig. 4:,the engine will be driven left hand, and conversely when the steam orother fluid pressure is admitted to the pockets on the other side of theengine, these pockets being direct ed in a reverse direction, cause therotation of the rotary member in an opposite or clockwise direction.

lVhile suitable means may be provided to control the flow of the fluidprehsure or steam into the initial or high pressure pockets 12, and thensubsequently into the com pound pockets 10, l have shown in the presentembodiment of the invention two differ-.

ent systems of valve mechanisms for accom- 'plishing this control offlow, and, as clearly illustrated inl ig, 2, end plate 7 of the engineis shown as provided with diametrically opposite and alined upper andlower steam chests 13 and l i, and within these chests there areslidably mounted suitable types of valves, for instance, the well knownl3 valves 13 and 14% these beingconnected together through means of thepiston rod connecting link 15 which is provided with a central. slottedportion at 15 to straddle the shaft 8. To secure the proper timing andmovement of the valves 13' and let the connecting rod 15 is suitablyactuated by appropriate connecting means with the shaft in this form ofengine the connecting rod 15 is provided Tlllll a stem 16 which maycarry an anti-friction roller 16-this adapted to operate in an internalcam 17 lreyed or otherwise suitably secured to the shaft 3.

tlteain is supplied to the seve'a-l valves of the engine through meansof a steam main 20, Fig. 5, which may be provided with a throttle orcut-oil valve 21 and is branched. as at 22 and 22 to provide respectireconnections to the opposite end plates of the engine, branch 22 beingprovided with a valve 23 which in turn is connected with a branched pipe24 Fig. 1, leading; to the upper and lower steam chests 13 and 1 lrespectively. The D valves in these che' are adapted to open and closerespective steam passageways leading through the end plate 7 to thesteam chambers 12 and i0, shown in Figs. and 3 the steam chests 13 andis: are provided with outermost ducts or passageways 13 and l trespectively which lead inwardly and dis charge into respective pockets13 and 1 formed on the inner surface of the end plate '7 in. a rirclc inwhich the high pressure pockets of the adjacent face of the rotor l: areprovided. Next adjacent and inwardly from the. mouths of the ports 13and 145" there are provided steam passageways 13 and I l, these beingdirected through the end plate 7 transversely and thence outwardly, asshown in Fig. 2, to communicate with corresponding ducts formed in thecasing l3, and leading into the outer compound steam pockets 11. Belowthe mouths of the passageways l3" and ii and nearer he cm 0; of theplate there are further proi 3d anothr set of high pressure steam portsor passageways l3 and 1-1, these being directed through the end plate 7angularly across the same as shown in Fig. 3 to communicate withrespective pockets 13 and 14 which also are disposed in the circlecolirdimite with the circle in which the high pressure pockets 12 in theadjacent face of the rotor operate. Thus there is provided in each steamchest 123 and 14- a series of three ports, for instance in the chest 13ports 13, 13" and 13. When the valve 131 is actuated through means ofthe cam 17' to the position shown in liig. 2, live steam or other fluidpressure is permitted to pass through the innermost port 3 and thenceinto the connected pocket 13" which will theretttnre be charged withsteam under full pressure and as the rotor lrotates it will bring one ofits pocluts lit adjacent to the pocket 13 and pressure will be permittedto enter rhe pocket 12 and impinge upon the abutment surface or wall 12oi the latter and cause. the rotor to tin-n. While D valve 553 is in itsuppermost po eitiozu eoiunninieation is also established at ihis timebetween the pocket which is connected to the uppern'iost port 13, hi 3,and the valve 18 is provided in. its bottom surface with a recessedportion which permits the How o'l. steam from the steam port.

13 into the steam port 13, thus exhausting one of the rotor pockets 12through the con tiguous pocket in the end face, and through. the port12-3", thus allowing the steam to expand through the last port and passinto the peripheral pocket ll so that when a pcripheral pocket oi therotor moves into juxtaposition thereto the steam is further paudcd. andits :t'oree utilized on the periphery ol? the rotor to rotate thelatter. in a similar nuinner control of the steam is to be through thelower l3 valve l-l, this being shown in ,ll ir :3 in its upper positionand uni-merino the port it to permit high pressure steam to passtherejinto and into the end wall pocket ll to supply steam to a poclu-rih the adjacent :taee of the rotor. Iilhanwhile the steam exhausting fromone of the puehetai at 'lt', through the steam passageway it. andbeneath the valve l l thence ontn'ai'dly thrtiuojh the s eam passigewayll" to the peripheral pocket SllOWll in the tour! portion of Fig. E2.

fit each quart r rotation ot the rotor l the position of the valves 13and 1 is al.- ternated so that the previouel uncovered ort-i lli)})l\l1l; steam innler tull pressure to the high pressure pockets arecovered and the other sesie: ct {)Ilr-ltid'fllVthVS uncovered to gun-innthe How of steam in the tlptmfrltti d (ion to silllliij. the nextsiiccetalinn'series; oi rotor pockets.

l hih a similar 'lorni of valve control ,lllt't'llttlilfiill ma beutilized. upon. the opposlit end p ate S of the engine. I prefer toutilize a torui oi valve which will, permit ill more rand, operation oithe rotor by the lFlUYlHl'Ill! oi instantaneous tlov; oil steani troutth steam valve chambers to the high pl'rsrilrr pockets oil the rotor,and. this may be readily? :u-complished through the utilization ol atorn! oil instantaneously acting; steam zurtuated valves these havingthe advantage by moving more quickly and of supplying an1 more rapidlyand tor a longer period of time at high pressure than is possible toobtain by the form of D valve util'aed on plate I. Tlherefore forordinar driving pin-poses when greater power is obtained the valve 22;ot' the branch pipe 22 from the main :30 is closed and steam is directedthrough branch pipe which is provided with a valve 23 connected to asuitable svsteui ol branch pipes illustrated in i igg. at 31. "thesebranch pipes lead respcetivuly into upper and lower steam (illdt'ii h'1351 and 23''. in each of these steam chests there arranged a piston orbobbin \al\'e 2tand 26" shown in Fig. 2. As these valves aresubstantially (ltl; ')li0ut6 and operate in steam chests provided withsubstantially duplicate sets of steam ports and pasa description of oneof these stean'i libiiuli valves and its ports or strain ren'ays wil Ar;slfonn in Fig,

sullice to describe both. T and (5, the piston valve 12h is reciprra:all mounted in its chamber and moves into contact at opposite ends of?the chest 25 with suitable end plugs or stops 2?. The piston :20 isshown as prorided with two suitably spaced peripheral. ores :36 and 15%;which in their position i one end or the other oil? the steam chest areadapted respeetirely to i'e 'ister with I-LPill'ttl supply ports 28 or:58 which connect with a common passageway 29 to which the adjacent endoi the steam lced pipe 2d may be connected. l't'hen the piston valve 13his in the position shown in l igs. 7 and t5, the annular groove or port:56" registers with a supply port .30 leading into a compleeutarrpassage av Ell, this in turn openinilo one ol' the wide pockets as 31,on inner face oil the end plate 8 so that. as rotor l: rotates one ofthe side pockets 53 thereof will he applied With steam unfull pressurehe force of which iniupon a ra lial wall of the pocket with i'urre tendto rotate or drive the rotor. tonnnunieatingz; with the passageway 31there is provided next adjacent to the high pressure pasagen=av or porta passageway 32 which leads angularlv through the Wall 0!. bodystructure of the steam chest 25 and 2:: or; d sposed, at its mouth thatwhen tie piston .36 is in the position shown in l igl' i and S thecentral body portion of the piston rovers the paa'zaigemiy Adjamaut tothe paesapewa r 32 there is proridedv a similar passageway 39 which connects with a strain i 'iassaeen'ay 31, this in turn leadi: in anoppoeite direction from the 1" 31 so as to supply steam under :lullpressure to a pocket 31. lVhen one oi the swan: pockets 1.2 in theadjacent side oi? the rotor moves into registration with the stea. a:pocket 31. it there is steam under pressure in the pocket 12 this steamwill be permithid to exhaust through the passage *ays 31 and 32 into theannular grooves 26 ot the piston 26, this groove being. when the pistonvalve is in the posit-ion shown in Figs. '7 and 8., in registration wlthone of the mouths of an exhaust port which is provided with a ductleading upwardly and outwardly into an adjacent compound pocket ll. asshown in Fig. 2. Next'adjacent the exhaust port 32 there is provided ahigh pressure port which, with the piston valve 26, shown in itsposition in Fig. 8, is covered by the end body port on of the valve andtherefore steam pressure cannot pass into the port 30 while the port ris maintained in co1nn1unication with the groove 26 to e'll ect the oX-haust of steam pr ssure from the pocket 31*.

The piston valves 26 and 26 are adapted to be each reciprocatedalternately through :tluid pressure during the cycle of rotation of therotor I so that the valve 26 at one time supplies steain pressurethrough the port 30 to one of the high or initial pres sure pockets inthe side wall or to the other of the pockets. To secure the automaticoperation of shifting the piston valve tron: one position to the othersuitable ducts are provided, as shown in Figs. 3 and 7, whereby steamunder pressure may be conveyed from one of the pockets 12 of the rotorin the adjacent side 8 of the engine to one or the other of the ends ofthe chamber in the steam chest in which the valve 26 for instance,operates. For that purpose, from the right hand end of the steam chest.shown in Fig. 7, of the valve 2t3tl1ere is indicated a by-pass portorduct 3:4; which is directed through the body of the end plate downwardlyto a suitable point 35 where lb is adapted to be uncovered by one oi theupwardly moving pockets 12 in the adjacent side (if the rotor, thispocket having previously been supplied with steam from the lowerautomatic valve 26. Therefore when steam enters the mouth 35 ot' theby-pass duct 3-isteain will enter the righthand end of the steam chamber25 of the valve 26 and the pressure reacting on the end of the lat-t rwill causethis to be shifted toward the left and thereby cause the highpressure steam port 30 to be covered, the exhaust port 32 to beuncovered, exhaust port 32 to be covered, and the adjacent high pressureport 31 uncovered by registration with the annular groove 26 so thatsteani under full pressure from the chamber 29 may pass then. to thepassageway 31 and pressure he introduced into the adjacent pocket 12 orthe moving rotor. The valve is adapted to be pushed toward the right bythe admittance of lluid pressure into the left end of the steam chest 25through means of a duct or bypass opening through the end plate 8 of theen gine into COHllntllllCillllOH with one oi? the pockets 12 of therotor as this latter swings into registry with the mouth of the by-passor duct 34.- thus obtaining the position of the piston valve shown inFigs. 7 and 8. After the valve is shifted by pressure in 5-}: or thispressure stalls as the rotor pockets pass the wall pockets or may be e:r

hausted to the compounding ports if desired.

From the foregoing it will be seen that steain under high pressure isinitially used in the several steain pockets or chambers arranged in theend walls or races or the rotor and by the proper movement of therespective valves the steam is aoapted to exhaust after a predeterminedmovement of the rotor back through the valve or steam chests and thenceoutwardly through ports or passageways so as to be expanded or used toimpinge upon the abutment walls of the pockets 10 of the rotor l. Thatsteain which has been expansively used or C0111 pounded in the compoundpockets 10 of the rotor is ada ited to be exhausted through theregistration of the pockets 1.0 of the rotor as into juxtaposition withthese latter inove suitable exhaust passageways or pipes (i which may beprovided. at appropriate positions about the periphery oil the casingt5. li'hile the position of the exhaust ports (i for permitting therelief of pressure or exhaust of the steam from the compounding pockets10 of the rotor may be located at suitable points, preferably they areso disposed. that attcr the energy of the steam has been expansivelyused to a predetermined degree in the pockets 10 these latter as theypass out oi coordinate relation with the poclre 11 at the upper andlower portions of the casing 6 will move into registration with theinner ends or the ports 6 and the steam thereby be exhausted.

reversing the relative positions of the pockets 12 or 31 on the oppositesides of the rotor and by reversing the respecti e positions of theperipheral poclretsin the two series trained about the circumference ofthe rotor, it will be seen that by closing the valve 2 5, for instanceafter the engine has been running in a clockwise direction and openingvalve 23 steain will be diverted from the main 20 to the opposite sideoi? the rotor, and its admission will be controlled tl ereto through theactuation of the piston valves 13 and 14: and the rotor be driven in aleft hand direction, for instance. desired to entirely stop the engineit is only necessary to open the valves 23 and 23 simultaneously. Thereacting force acting oppositely upon the rotor will cause the latter toslow down and stop. To entirely stop the operation or the engine thevalve may be closed or either the valve 23 or 23 as may have been in useduring the operation of the engine.

t fhile l have shown the compounding pockets as arranged peripherallyupon the n it it be rotor it is obvious that they may be disposed at anyother suitable point or zone about the rotor, and this also may be saidof the high pressure pockets in the sides o the rotor.

To prevent loss of pressure between the running joints of the severalparts oi. the engine suitable packing members may be in troducedthroughout the arrangement oi? the engine, and in tl e presentorganization there is provided at each side of the rotor +1, as shown inFig. 2, end wall pachin it), the pressure oil which. may be variouslycontrolled through means ol? set screws or other suitable devices -.l-l.There is also shown adjacent each edge of the peripheral portion oil therotor -lannular packings l2, these being iilisposed in grooi es formedin the cylindrical casing (3.

What 1 claim is:

1. in a rotary. lluiii-pressure operatrul inotor. a rotor having seriesol initial pressure and o:- pan:--:ion or compounding pockets withimpact :l aees. substantially radial in arrangementou the rotor a casingha ing; passageways providiin 'lor coniniunicarion in propel. sequence.oi the initial and ex" pansion pockets. a l'luid-pressure supply, and aralre arranged in the casing for controlling admission of lluid to oneol'" the initial or high pressure pockets and ctnu'urrentlyestal'ilishin Connection between another high pressure pocket and anexpane-Lion. pocket, and exhaust mean; for the series of expansionpockets.

lln a rotary. l'luid-pi.'o.--rsui'e operated motor, a rotor having aseries of high pressure pockets and a ies of low pressure pockets in itssurface, said pockets hayineat one end an impact face substantiallyradially disposed, a casing in which the rotor is mounted, alves in saidcat-:ing. a fluid pressure supply, and direct and expansion steampassageways in the casing controlled hy said Valves. each Valve'n'ovidiug tlor expansion of steam from the initial or high pressurepockets to the expansion pockets. and ex haust means registrable withthe expansion pockets to provide For exhaust of pressure therefrom.

3. In a compound rotary motor, a rotor having series of pockets eachpocli'et having asubstantially radial impact Face. a casin inclosing therotor, a source of fluid pr sure, and means for controlling the supplyof high pressure initially to one series ol pockets and concurrentlyconnecting a given high pressure pocket to one of a second series andmeans providing for the exhaust oil pressure from the latter series.

4t. In a compound rotary motor. a rotor haying series oil. pockets withinclined bottom Walls, each pocket having a substantially radial impactface, a casing inclnslng the rotor, a source of fluid pressure, and

means for controlling the supply of high pressure initially to oneseries of pockets and concurrently connecting a given high pr surepocket to one of a second series, and means providing for the exhaust ofpressure from the latter series 0. In a compound rotary motor. a rotorhaving series of pockets with inclined bot,- tom Walls, each pockethaving a substantially radial impact face. a casino inclosingr therotor, a source of lluid pressure. and means for controlling the supplyof high pressure initially to one series ol. pockets and concurrent];'connecting a given h' 'h pressure pocket to one of a secoiul series, andmeans providing for the exhaust oi pressure from the latter series, thebottoms of said pockets all synnnetr' :ally inclining; in the coordinateseries andv terminating at their inner and deeper ends at the roots oftheir respective impact faces.

6. In a compound rotary motor. a rolor having series of pockets. eachpocket having; a si'iliistantially radial impact face. a towing:inclosing the rotor, a source of fluid pressure. and means forcontrolling); the supply of high pressure initially to one series olipockets and concurrently connecting a given high pressure pocket to oneof a second series, and means prorii'ling tor the exhai vat of pressure"from the latter series, the ini-- pact faces of coordina to series allheme symmetrically disposed.

7'. In a compound rotary motor. a rotor having; series of pockets, eachpocket having); a substantially radial impact face. a casino inclosing'the rotor, a source of fluid pressure, and valves for controlling thesupply of high pressure initially to one series o'l pockets andconcurrently connecting a given high pressure pocket to one ot' a secondseries. and means providing tor the exhaust of pressure 'from the latteseries.

8. In a compound rotary motor, a casing. a rotor mounted therein. asupply for ilnid pressure, a series of passageways lor high pressureleading to the rotor, a passageway leading to a compounding pocket inthe ro tor, and a valve movable alternately to permit supply of highpressure to one or another oi said high pressure passagena andconcurrently connecting the other high pressure passageway to thecompounding; passageway.

9. In a reversible rotary motor, a casing,

fluid pressure supply means connected thereto. a rotor in said casinghaving series of impact or pressure receiving faces, the faces of oneseries directed oppositely to those of the other, valve controlledpassageways for each series of faces in the rotor. and manually operablecontrol valves in the supply means for selectively directing fluidpressure to one or the other of the said passageways to control. thedirection of rotation.

10. In a reversible, compound rotary motor, a casing, a rotor in saidcasing having a set of series of impact faces symmetrically facing onedirection on the rotor, another set of series of faces symmetricallyfacing and disposed to face oppositely to thoseof the other set, wherebypressure applied to one set causes rotation in a direction reverse tothat applied to the other set, a supply for fluid pressure, a vali 'ularcontrol means for each set of faces on the rotor, manually operablevalves for controlling passage of fluid to said means to letcrminedirection of rotation of the rotor, each set including high and low)ressure impact faces, and exhaust means for the lo a pressure faces.

11.111 a motor, a casing having high and low pressure chambers, a rotormounted in said casing and he inn; impact faces dicposed so as to besubjected to pressure of fluid in said chambers, chests each having highpressure compartment connectible to supply means, a double ported ductin each chest leading to a respective low pressure chamber, iighpressure ports leading from each chest to respective high pressure chanrhers, return ports from said chambers, and a valve in e: ch chest foralternately connecting said return ports and the 10W pressure (:luct andconcurrentl connecting one of the high pressure ports with saidcompartment, and passageways in the casing for supplying Itluid pressurefrom the rotor to actuate the valves.

12. in a motor, a casing, a rotor mounted therein, a valve chest havinga live or high.

eas es pressure chamber, a double ported, com pound duct in said chest,sets of high pressure and return ports leading to and from a highpressure chamber in the casing, and a valve in. the chest havingport-Ways regis trable alternately with respective high and return portsof said sets, and alternately with the ports of the compound duct.

13. in a motor, a casing, a rotor mounted therein, a valve chest havinga live or high pressure chamber, a double ported, compound duct in saidchest,- sets of high pressure and return ports leading to and from ahigh pressure chamber in the casing, and a fluid pressure ope 'atedvalve in the chest having port-Ways registrable alternately withrespective high and return ports of said sets, and alternately with theports of the compound duct.

14:. In a motor, a casing having highand low pressure chambers, a rotormounted in said casing and having impact faces disposed so as to besubjected to pressure of fluid in said chambers, chests each having ahigh pressure compartment connectible to supply means, a double portedduct in each chest leading to a respective low pressure chamber, highpressure ports leading from each chest to respective high pressurechambers, return ports from said chambers, and a valve in each chest foralternately connect- .ing said return ports and the low pressure ductand concurrently connecting one of the high pressure ports with saidcompartment.

in testimony whereof I affix my signature.

RICHARD CLAYTON FRASER.

Qepics nit this patent may he obtained for five cents each, byaddressing the Gommissicner ct Patents Washington, D. 6.

